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x in (-oo:+oo)
6-((5/6)*x) >= 9 // - 9
6-((5/6)*x)-9 >= 0
(-5/6)*x-9+6 >= 0
-5/6*x-3 >= 0 // + 3
-5/6*x >= 3 // : -5/6
x <= 3/(-5/6)
x <= -18/5
x in (-oo:-18/5>
(-oo:-18/5>
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